Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas datas de lançamento o Canadá teve?
 ###Tabelas: CREATE TABLE performance_at_the_pga_grand_slam_of_golf (performance_at_the_pga_grand_slam_of_golf_id AUTO_INCREMENT PRIMARY KEY, Year INT, Round 1 VARCHAR, Round 2 VARCHAR, Place INT, Money ($) INT) CREATE TABLE release_history (release_history_id AUTO_INCREMENT PRIMARY KEY, Release format VARCHAR, Country VARCHAR, Label VARCHAR, Cat. No. VARCHAR, Release date INT) CREATE TABLE tournament_champions (tournament_champions_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Champion (seed) VARCHAR, Score VARCHAR, Runner-up (seed) VARCHAR, Most valuable player VARCHAR) CREATE TABLE comparison_of___features (comparison_of___features_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Wikis VARCHAR, Web publishing VARCHAR, Calendaring software VARCHAR, Project Management VARCHAR, Workflow system VARCHAR, Document Management VARCHAR, List Management VARCHAR, XML Forms Management and workflow VARCHAR, Discussion VARCHAR, Blogs VARCHAR, Surveys VARCHAR, Time Tracking VARCHAR, Business Intelligence VARCHAR, Charting VARCHAR, Bookmarking, Tagging, Rating and Comments VARCHAR, Social software VARCHAR, Enterprise search VARCHAR, Office suite VARCHAR) CREATE TABLE conto_tv__&__teleitalia (conto_tv__&__teleitalia_id AUTO_INCREMENT PRIMARY KEY, Television service VARCHAR, Country VARCHAR, Language VARCHAR, Content VARCHAR, HDTV VARCHAR, Package/Option VARCHAR)  
SELECT COUNT Release date FROM release_history WHERE Country = canada